History YMMV / HawaiiFive0

** Gerard Hirsch only makes a few appearances per season after his debut, but his role as a reformed criminal with a goofy crush on Kono makes him pretty popular.* FanPreferredCouple: Steve/Danny, aka [[PortmanteauCoupleName McDanno]], despite Steve having dated Catherine and Danny getting back together with his ex-wife, Rachel. The sheer amount of fanfiction, communities, and board threads devoted to them are staggering.

** The main victim "Makaukau 'ce e Pa'ani?" who died with a note pinned on his body that he was a criminal hits hard in the Philippines following President Rodrigo Duterte's elevation as president that criminals are being executed, allegedly by rogue cops or anti-crime vigilantes with signs placed on them that they're criminals, which is being criticized by law enforcement analysts. One of the most prominent victims is Maria Aurora Moynihan, the daughter of ex-Baron Moynihan and sister of Philippine actress Maritoni Fernandez.

* FanPreferredCouple: Steve/Danny, aka [[PortmanteauCoupleName McDanno]], despite Steve having dated Catherine and Danny getting back together with his ex-wife, Rachel. The sheer amount of fanfiction, communities, and board threads devoted to them are staggering.

* TrueArtIsIncomprehensible: The art gallery in "Mana'o".

* SpecialEffectsFailure: Unfortunate example in the third season premiere, when [[spoiler:the helicopter airlifts away the (moving) armored truck carrying Wo Fat.]] Ruins an otherwise perfect SugarWiki/MomentOfAwesome. Compare that with the much more technically ambitious, [[SugarWiki/MomentOfAwesome completely [=CGI=] free plane-lift scene from]] ''Film/TheDarkKnightRises''. Let's just say that if your CG effort at a smaller-scale version of this looks like a video game cutscene, you are DEFINITELY doing something wrong.

** In the first season, Kono makes a comment about Chin's wife-to-be, Malia, abandoning him when he needed it most and is rather bitter about it. [[spoiler:Much later in the series, Malia and Kono are put in SadisticChoice that Chin can only save one of -- and he chooses Kono, unwittingly returning the favor to his wife even if it utterly breaks his heart.]]

** though this was aired on the same day Amanda Berry was freed after being held captive for a decade, Season 3's "Ho'opio" involved another girl named Amanda being held captive for 10 years. Except [[DownerBeginning it wasn't as happy]] [[VictimOfTheWeek an ending]] as the Cleveland case.

* AuthorsSavingThrow: The pilot used a [[https://www.youtube.com/watch?v=rLKdYXyQa90 "modernized" theme song]] heavy on the electric guitars and synth drums; after it was sent it out to critics, it met with such overwhelmingly negative response (unsurprisingly, given that the original theme is considered [[SugarWiki/AwesomeMusic one of the greatest in TV history]]) that the producers actually [[https://www.youtube.com/watch?v=lUt558jdHqk re-recorded the theme]] using the traditional orchestration (including three musicians who participated in the original 1968 recording). Even though it was still cut to thirty seconds (commercial time is ''far'' too valuable to allow for a minute-long theme song nowadays), the gesture was still greatly appreciated by classic fans and pop culture historians. (And the lesson was learned; years later, when the same production team remade ''Series/MagnumPI'', the original theme was featured with the only major change being its length.)

* CriticalResearchFailure:
** A few things in "Ua Hopu".
*** For instance, Interpol having a worldwide tactical team in Osaka, Japan. Which doesn't work since Interpol is a collection of police agencies working together by sharing intelligence. Although Interpol does have a tactical team responsible for protecting Interpol facilities in France.
*** Same thing with the uniforms of Japanese police officers. Although the basics are correct (e.g. vest, cap, shirt), the shoulder patches and the kanji for the vests are incorrect. In the episode, the kanji is portrayed as "特別警察官", which means "Special police officer" in Japanese. Although it's correct, all Japanese police officers have vests with the kanji "警察庁;", which means "National Police Agency". And don't get started on the Osaka Police crime scene investigators.
** In "A ia la aku" (for the first episode filmed in Hong Kong), the sedan Kono and Adam rode in has mainland Chinese plates, when it's stipulated by Hong Kong laws that mainland-based vehicles should have Hong Kong plates affixed at the front and back in order to be admitted into Hong Kong territory. Also in "Kupuʻeu", the sedan Kono and Adam use is [=LHD=], despite having the correct Hong Kong license plates on.
** All of 3.20. While Catherine has apparently been in combat situations previously, as noted during that episode and in Season 4 (she's done three tours in Kabul), and being part of MissionControl probably wasn't her first or only role with the Navy, there is still no chance an Naval Intel Officer (Catherine) has the kind of training to keep up with a SEAL (Steve).
** The gun shop in "Hookman" is packed to the gills with [=SMGs=] and select-fire rifles that are banned in the state of Hawaii.
** In "Hana Komo Pae", it's mentioned that the Philippines has the death penalty, which is incorrect. [[https://en.wikipedia.org/wiki/Capital_punishment_in_the_Philippines It's not been used after 2006]], but it could change since Duterte wants the death penalty be brought back as part of his campaign platform after he got elected in the 2016 elections.

* UncannyValley: The CGI version of Jack Lord that [=McGarrett=] talks to in "Makaukau 'ce e Pa'ani?" unfortunately hits the valley hard.
* WhatAnIdiot:
** The Yakuza boss forgets to clear his fingerprints off the stolen Champ box and throws it in the dumpster outside his own bar -- leaving just enough clues tying him to the kidnapping that Five-0 can arrest him.
** Marco Reyes has Danny and Steve dead to rights after he just [[spoiler:gave Danny his brother back as a corpse in a barrel, causing him to have a very brief FreakOut]], and was just told by Danny to kill him now or [[ItsPersonal face his vengeance soon enough]]. Marco, trying to be some sort of reasonable man yet clearly arrogant and ignorant to just what these two are capable of, tells him to cool down, go home and never return to Colombia least something happens to Danny's daughter, unknowingly pressing the latter's BerserkButton even further as he lets them go. [[spoiler:Not even a minute later and the duo kill all of Reyes' guards off-screen and Danny comes back down to terrify him before [[BoomHeadshot blowing his brains out]] in probably the fastest dosage of LaserGuidedKarma for a multi-episode antagonist all series long.]]
** The perp in "Kupale" gets caught by the wife of his victim at gunpoint, and she's about to kill him any second even as the Five-O roll in to try to arrest him and stop her from committing murder. Despite pleading she's insane and that he's innocent, he's smart enough to realize he was in deep trouble -- and dumb enough to take her hostage with her own gun when she gets distracted. [[TooDumbToLive With his body totally exposed while he's surrounded.]] Steve just shakes his head in disbelief before plugging the man in the shoulder, resolving the situation altogether.

* FoeYay: Gabriel Waincroft seems to have a massive crush on Chin, his brother-in-law. Just look at him during his appearance in ''A Makekaua''; he comes off as if he had just gotten rejected.

** If the episode decides it's time for a dramatic fistfight, all the usual combat rules fly out the window, both combatants become implausibly MadeOfIron as the two beat the utter hell out of eachother and throw eachother onto just about every destructible object in the room if not multiple rooms, and allies that were potentially right behind the hero inexplicably disappear to let the fight rage on unabated. For most series, this would be RuleOfCool and RuleOfDrama alike for a climactic final battle. For ''Hawaii Five-0'', this is basically every serious bad guy that isn't meant to be shot or a pushover.

** If the episode decides it's time for a dramatic fistfight, all the usual combat rules fly out the window, both combatants become implausibly MadeOfIron as the hero and villain beat the utter hell out of eachother and throw eachother onto just about every destructible object in the room if not multiple rooms, and allies that were potentially right behind the hero inexplicably disappear to let the fight rage on unabated. For most series, this would be RuleOfCool and RuleOfDrama alike. For ''Hawaii Five-0'', this is basically every major foe that isn't meant to be shot or a pushover.

** If the episode decides it's time for a dramatic fistfight, all the usual combat rules fly out the window, both combatants become implausibly MadeOfIron as the hero and villain beat the utter hell out of eachother and throw eachother onto just about every destructible object in the room if not multiple rooms, and allies that were potentially right behind the hero inexplicably disappear to let the fight rage on unabated. For most series, this would be RuleOfCool and RuleOfDrama alike. For ''Hawaii Five-O'', this is basically every major foe that isn't meant to be shot or a pushover.

* FanPreferredCouple: Steve/Danny, aka [[PortmanteauCoupleName McDanno]], despite Steve dating Catherine and Danny getting back together with his ex-wife, Rachel. The sheer amount of fanfiction, communities, and board threads devoted to them are staggering.

* FanPreferredCouple: Steve/Danny, aka [[PortmanteauCoupleName McDanno]]. The sheer amount of fanfiction, communities, and board threads devoted to them are staggering.